FI84219B - Auxiliary device with several functions for a timber gripper - Google Patents

Description

8421 9

TIMBER GRAPER MULTIFUNCTIONAL ACCESSORY

The invention relates to an accessory for attaching to a timber grapple, by means of which smaller trees can be pruned, cut and then loaded or transferred to a stack in an upright position.

Today, when harvesting small-diameter timber from the forest, the so-called from the forest growing in connection with the felling, some of the trees will have to be thinned when they are about 20-30 years old, in order to make room for the canopies of the trees to be left and to avoid the fall of the forest. The felling is mainly carried out as forestry work, in which the lumberjack fells the trees to be thinned, prunes and cuts them, usually into logs about 3 m long, which are collected in piles along the tracks and driven to a timber storage site, eg a forest tractor 1 la.

In the felling of larger trees, mechanical pruning and felling has been carried out using multifunctional forest machines, which most commonly first fell the tree and then prune and cut and transport away from the base. There is also a method in which the logger performs felling and the multifunction machine performs pruning cutting and transport.

At present, current multifunctional forest machines are not suitable for mechanization, especially for manual thinning, because the damage they cause in dense young forest becomes unreasonable and the monetary value of thinned timber is so small that it is not profitable to repair it with an expensive multifunction machine.

The accessory according to the invention provides a decisive improvement in this drawback. The invention is characterized by what is stated in claim 1.

The most important advantage of the invention can be considered that instead of a large and heavy forest machine, mechanical thinning can be performed in a young forest with a light land-based loader. The tree is pruned and cut in an upright position, so that the adjacent trees are damaged as little as possible.

2,84219

In the following, the invention will be explained in more detail with reference to the accompanying drawing, in which:

Figure 1 shows the accessory in the open position.

Figure 2 shows the accessory in the pruning position.

Figure 3 shows the fit of the accessory to the timber grapple.

Figure 4 shows a partial view of the lower part of the accessory.

Figure 5 shows a coupling member with an articulated joint.

Figure 1 shows an accessory in which the two arms 1 and 2 acting as a body are connected to each other by means of a hinge piece 4. Cutting blades 5 are formed in the lower part of the stems, which, due to the movement of the stems, cut the wood placed between the blades. The arms 1 and 2 are in the open position, according to which the device is brought to the side of the tree so that the guide rods 11, 12 and 13 control the position of the device relative to the tree with the tree partially inside the device. The device can be used to lean slightly towards the tree. The arms 1 and 2 are then brought closer to each other, whereby the movable pruning blades 7 and 9 begin to wrap around the tree. The fixed pruning blades 6 and 14 also approach the side of the tree. As the stems are sent to each other, the space between the cutting blades 5, into which the tree trunk eventually enters, also opens up.

Figure 2 shows the device in the pruning position, the tree being surrounded by the device. When the implement is now lifted from the base of the tree towards the top on the implement boom, the tree is pruned at the same time. The pruning blades 7,9 which can be turned by means of the hinges 15 and 16 are spring-loaded by means of the arms 17 and 18 comprising a spring so as to be able to retract in the opening direction. The springs can be double-acting, so that the pruning blades can converge more than required by the position of the arms 1 and 2.

Once the wood has been pruned to the top, it is advantageous to bring the device down to the first cutting position under the guidance of the wood and only then the arms 1 and 2 are opened, whereby the blades 5 cut the wood. The device is then brought further downwards and, if necessary, cut again 3 84219 by first closing the arms 1,2 and then opening, whereupon the tree breaks. At least the top surfaces 8.10 of all pruning blades 6, 7.9 and 14 are sharpened.

Figure 3 shows an arrangement for attaching an accessory according to the invention to a timber grapple. Sleeves 19 are attached to the gripping arches 21 and 22 of the timber grapple, to which the corresponding pins 3 of the attachment are guided. The connection can be secured with dowel pins. The hydraulic cylinder 20 moves the arcuate parts 21, 22 of the grapple 10 with closing or opening movements which are transmitted to the arms 1 and 2 of the attachment.

Figure 4 shows a partial view of the lower part of the device. Attached to the lower surface of the device are nails 23, by means of which the logs are used for loading. The nails are located on the lower surface at the edge on the grapple side, so that they do not interfere with the cutting with the blades 5.

In Fig. 5, the coupling pin 3 is provided with a pivot joint 24, 20 which is at most the same size as the peg 3 and thus fits in the grapple sleeves 19. If the accessory is to be lifted the accessory 25 can then be lifted up and locked in some known manner. It is also possible to lock the retention of the pins 3 in the sleeves 19. After this, the accessory does not substantially interfere with working with the actual grapple.

In particular, it should be noted that the invention has been described with reference to only one exemplary embodiment, but this is not intended to limit the invention to this example only, and many modifications are possible within the scope of the claims. Attachment of the accessory 35 to the curved parts of the grapple can also be performed with other solutions, e.g. with a fastening method in which the device can be moved upwards, e.g. along guides.

Claims (8)

1. Auxiliary device for a tool most notably for a wood bucket, which is attached to the end of a moving loading or lifting boom of vehicles or machines characterized in that the extension device comprises, by means of a joint (4), mutually joined shafts (1) and (2). ), at the ends of which are shaped edges (5) for interrupting wood with press cutting and said shank comprises fixed (6,14) and / or around a joint (15,16) turning twigs (7,9) and to be attached in the said tool, the shaft (1,2) causes sinew movements of the tool movement. 2. Auxiliary device according to claim 1, characterized in that both the shafts (1) and (2) comprise a pin (3), which pins fit into corresponding holes (19) of the tool, formed a connection between the auxiliary device and the tool. 3. Auxiliary device according to claim 1 or 2, characterized in that nails (23) of the auxiliary device are mounted below the cutting edges (5) for gripping wooden products during loading with the auxiliary device. Auxiliary device according to one or more of claims 1-3, characterized in that the front of the auxiliary device comprises control means (11,12,13) for facilitating the control of the auxiliary device instead of wood. Auxiliary device according to one or more of claims 1-4, characterized in that the movable branching edges (7,9) comprise resilient closing and opening devices (17, 18), which allow said edges to yield at least to opening direction. The egg-laying device according to one or more of claims 1 to 5, characterized in that the interrupting edges (5) are located below the guide point (4) of the shaft (1,2). 7 84219 Auxiliary device according to one or more of claims 1-6, characterized in that the fastening means (3) / which joins the attachment device with the tool comprise joints (24) or control lines for turning or lifting the auxiliary device in its said fastening means. 8. Auxiliary device according to claim 7, characterized in that the fastening means (3) comprise a rupture joint (24) which can be pushed into a hollow (19) of the tool.